On 02/20/2017 03:45 PM, Wols Lists wrote:

But there's a request on the linux wiki program for someone to write a
utility program that takes a ddrescue log and flags the duff sectors as
"soft unreadable". That would mean that if you can recover 35 drives,
provided no stripe has lost two sectors across two drives, you wouldn't
lose any data.

If you want to try and write that utility? Or if you want to email me a
ddrescue log with a bunch of failed sectors, I'll have a go at writing
it myself :-)

Check out hdparm --make-bad-sector.  You can get what you are describing
by scripting that.  It's marked very dangerous, but I guess if one has
nothing to lose....

Phil